North Korea has threatened the United States with a preemptive nuclear attack. The threat came hours before the United Nations Security Council approved tougher sanctions against the regime. North Korea is not believed to have the capability the launch such a strike. Sally Kidd is in Washington with the latest.

A day after Trevor Noah was declared the new host of "The Daily Show," complete with the blessing of the exiting Jon Stewart, graphic tweets targeting women, Jews and victims of the Ebola virus are causing a social media backlash.